Fiber Glass Asphalt Shingles Vs Organic Asphalt Shingles in Dallas Fort Worth Area

Both are good choices. Your choice will depend on
 1) Location
 2) Aesthetics
 3) Budget
 4) Availability

 Generally, its more important how many years of warranty (20 year, 25 year, 30 year, etc) a company will give. That is more important then what the shingle is made out of. Now, having said that, fiberglass is better for our region here in Texas, more and more companies are moving towards fiber glass mat. Fiber glass is also fire resistant.  Also the fiber glass shingles work better in hot weather.  Both the shingles are made with asphalt, but the mat in different.  One has more wood, and the other has more fiber glass.

The difference between the two is more of a concern to the roofers usually.  The organic shingles are more flexible, and the mat is thicker of the two.